biocide best practices...use a different preservative maintain results and potentially save money....
TRANSCRIPT
Biocide Best Practices
Jordan McNally
• How we started
• Things to consider
• New challenges
• Result Target
• Data Gathering
• Example Trial
• Overall Comparison
• Conclusions
Outline
2
How we started
• Water Management group started
looking at biocides used in 2013
to control costs on water recycling
projects
• We were using glut-quat for
stimulation and drill out operations
• Moved to using an oxidizer
biocide
• Cost consistency
• real time verification
• Consistency
3
0.25 0.5 1 1.5
$$/
bb
l
gpt
Biocide Comparison
glut/quat
ClO2
• Sources of contamination
• Drilling mud
• Stimulation fluid
• Drillout fluid
• Production activity
• Application
• There is no one size fits all biocide
• Area specific
• Water specific
Things to Consider
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• Produced water
• Fresh water
• High iodide levels
• High pH
• Frac chemistry
New Challenges
5
Results Target
• Target levels
• 1 or less bug bottle turn is
great
• 1-3 is okay
• More than 3 unsatisfactory
• Use serial dilution test method
• Log based measurement of
bacteria
• 6 month bacteria free
treatment is considered a
success
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Serial Dilution Technique, API RP 38
# of Positive Bottle Turns Bacteria Population (Colonies per mL)
1 1 - 10
2 10 - 100
3 100 - 1,000
4 1,000 - 10,000
5 10,000 - 100,000
6 100,000 - 1,000,000
Photo taken by Matt Patric
• 3/3 bug bottle shooting
• Sample points
• Contingency plans for downtime
• Daily reports
• pH
• ORPs
• Residual targets
• FAC
• Oxidizer residual
During Job Testing
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• In house bug bottle testing
• Test frequency: 1, 3, 7, 14,
21, 28 days, and every
month for 6 months.
• Test Procedure
• Sample location
• Heater Treater vs
Wellhead
Post Job Testing
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0
1
2
3
4
5
6
Wellhead Heater Treater
Sample Location
SRB
APB
1. Look at history in an area
• Pervious biocides used
• H2S present
2. Water type
3. Pick good well candidates
• Closely grouped wells
• Infill projects
4. Work with chemical providers for recommendations on biocides to
trial
5. Perform kill studies to determine dosage
6. Monitor results
Experimental Design
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Example: Different Oxidizer Trial
• Is there something more
cost effective we could be
using and still get the
same or better results?
• Tried Bleach +
Preservative B vs ClO2 +
Preservative B
10
Well Stim Biocide
Well 1
ClO2 + .2 gpt
Preservative B
Well 2
Bleach + .2 gpt
Preservative B
Well 3
Bleach + .2 gpt
Preservative B
Well 4
Bleach + .2 gpt
Preservative B
Well 5
ClO2 + .2 gpt
Preservative B
Well 6
ClO2 + .2 gpt
Preservative B
Well 7
ClO2 + .2 gpt
Preservative B
Oxidizer Trial Results
• Bleach performed just as
well as ClO2
• Save 14% by switching to
bleach with a
preservative instead of
ClO2
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0.00
1.00
2.00
3.00
4.00
5.00
6.00
SRBs APBs
Oxidizer Comparision
ClO2 +Preservative B
Bleach +Preservative B
• Looked to see if we could
use a different preservative
maintain results and
potentially save money.
• Tried Preservative B against
Preservative D.
Bleach + Preservative Comparison Trial
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Well Stim Biocide
Well 1
200 ppm bleach + 300 ppm
Preservative D
Well 2
200 ppm bleach + 300 ppm
Preservative D
Well 3
250 ppm Bleach + 200 ppm
Preservative B
Well 4
250 ppm Bleach + 200 ppm
Preservative B
Well 5
250 ppm Bleach + 200 ppm
Preservative B
Well 6
300 ppm Bleach + 200 ppm
Preservative B
• Both preservatives
performed well.
• Concluded we could use
Preservative D in place of
Preservative B since they
yield similar results.
Results
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0
1
2
3
4
5
6
Average SRB Average APB
Bleach + Preservative Comparison
Preservative D
Preservative B
Overall Biocide Comparison
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0
1
2
3
4
5
6
Average SRB Average APB
Overall Comparison
Bleach + 100 ppm Preservative B
Bleach + 200 ppm Preservative B
ClO2 + 200 ppm Preservative B
ClO2
Bleach + 150 ppm Preservative D
ClO2 + 150 ppm Preservative D
Biocides
Price, % of starting price
glut/quat 100%
ClO2 cost when we switched 100%
current ClO2 cost 30%
ClO2 + Preservative B 49%
Bleach + Preservative C 44%
Bleach + Preservative D 33%
Costs
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0%
20%
40%
60%
80%
100%
120%
Price, % of starting price
Prices
glut/quat
ClO2 cost whenwe switched
current ClO2 cost
ClO2 +Preservative B
Bleach +Preservative C
Bleach +Preservative D
• A bacteria monitoring program is important and must be
looked at regularly.
• There is no one size fits all biocide, trials should be
performed in different fields to see which biocide works
in each area.
• Pre and post testing is crucial for successful & economic
biocide program
Final Thoughts
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Questions?